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K3 switches the LPFs out of the receive path, so it is unlikely that any of the LPF circuits are the issue. As Scotty R. suggested, I would look for a possible heat issue.? This could be in any

First of all is this happening on all frequencies or on particular band or bands? If on a particulat band or bands using the same TX LPF then the respective LPF relay is suspect. If on all bands

Hi guys!! Have any of you have a band decoder to the sbitx?? Any ideas? Im doing a project and the amplifier uses3 lines for the lpf control. Before changing the software I would like to know if

Also, as a past RadioShack repair technician, I would like to suggest a can of freeze spray and a TINY heat torch to assist with troubleshooting poor connections and heat related failures. Many times

I had a similar experience, but the problem was not with the radio. It was a poor solder joint at the antenna. Once I would transmit the problem would go away then start to fade until I would key the

Last night I was thinking about it and I believe the first thing I'll try is cold spray. A bad solder joint could be the problem and cold spray sometimes reveals those. Possible bad relay noted...

You really have to scratch up these old memories. the same thing applies to the contacts for the Vibroplex Bug Brown Paper worked best as t was a little more coarse. Change out the relay take the old

Aha, before shortening/bypassing You can try open the radio and delicate knock K3 and K1 relays with screwdriver or similar tool. Sometimes phenomena/failure reacts on this - then You can be 99% sure

the traditional way to clean relay contacts depends on being able to carefully pry the plastic case off. Usually this can be accomplished. May require small "jeweler' " screwdrivers. Then take a

Hello, I will not write too much more than previous colleagues - I also would start checking relays. Yes, relays. RX path goes through TWO relays K3 and K1 (type HFD27/012-S relay). By default RX path

A dirty relay was my first thought, but the fading doesn't seem consistent with that. I'm just getting started with the problem. I have a fairly complete test equipment suite. Once I get inside I'll

JP Let's try what you have. Often the receive preselected is forgiving. Don't initially solder it flush, maybe on a couple leads. If your jukebox part doesn't have enough capacitance, put a small

Here is a copy and paste of my logbook on what I have done so far: * *Upgrade the operating software for sBITX-V3 / 581EFC18613 From sBITX-3.021 to sBITX-V4* *Starting with fresh SanDisk Ultra 128

Could be dirty contacts on a t/r relay.

Check the transmit/receive relay [email protected]> wrote:

Also, are you using stock firmware or something else? What aftermarket modifications have been done? (such as an added AGC or AVC circuit)

I wonder... is the issue receiver sensitivity or audio volume? What test equipment do you have available? (AC/DC voltmeter, oscilloscope, etc.)

I have a uBitX V6 that I've been using off and on for a couple years that has recently shown a tendency to intermittently fade its receive sensitivity. Triggering transmit (usually ) immediately

Can you test that the wm8731 works? Just open the browser and play something from youtube. [email protected]> wrote:

I have this for my uBITX and have gotten good results from it over the stock mic. I'm wondering if it would work for the sBITX also Topic: PROCOMM PSM4PM CB RADIO POWER HAND MICROPHONE 4 PIN (